Which of the following is not considered a local exhaust device?

Local exhaust devices are designed to capture and remove contaminants from the air in a localized area, helping to protect workers and ensure a safer working environment.

A chemical fume hood is a local exhaust device specifically designed to handle hazardous chemicals, providing ventilation to remove toxic vapors from the work area. Similarly, a canopy hood and a biosafety cabinet (BSC) also function as local exhaust devices by capturing and removing airborne contaminants to protect users and the environment.

On the other hand, unvented flammable liquid storage cabinets are not considered local exhaust devices. Instead, they are designed to safely store flammable materials without providing any means of drawing air away from the materials or protecting employees from potential fumes. Such cabinets do not have ventilation systems that actively remove vapors, making them unsuitable for addressing airborne contaminants in a laboratory or industrial setting. This lack of active ventilation distinguishes them from the other options listed, which effectively mitigate exposure to hazardous substances.